Hi,
There is a tutorial I'm sure using the active sonar, but I don't have the link for it. I think Dantenoc made a video of it. It used to be on my filefront page, but those guys like to remove stuff once and a while. But searching should come up with threads and links. And maybe Youtube still has them.
But this was just posted into the SH5 section:
http://www.subsim.com/radioroom/showthread.php?t=179137